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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
const UUID_RE = new RegExp(  "^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$",  "i");
export function validate(id: string): boolean {  return UUID_RE.test(id);}
export function generate(): string {  const rnds = crypto.getRandomValues(new Uint8Array(16));
  rnds[6] = (rnds[6] & 0x0f) | 0x40; // Version 4  rnds[8] = (rnds[8] & 0x3f) | 0x80; // Variant 10
  const bits: string[] = [...rnds].map((bit): string => {    const s: string = bit.toString(16);    return bit < 0x10 ? "0" + s : s;  });  return [    ...bits.slice(0, 4),    "-",    ...bits.slice(4, 6),    "-",    ...bits.slice(6, 8),    "-",    ...bits.slice(8, 10),    "-",    ...bits.slice(10),  ].join("");}